鞍钢含铁尘泥的循环利用

Cyclic Utilization of Iron-bearing Dust and Sludge in Ansteel

介绍了鞍钢含铁尘泥的种类、产量及各种尘泥的物理特性,对现行含铁尘泥的几种循环利用工艺进行了分析。结果表明:尘泥混合预处理后再参与烧结配料的工艺,虽然循环利用量大,但不宜处理高锌、高碱金属含量的尘泥。对于高Zn、高碱金属含量尘泥,采用生产铁碳球团工艺,加入铁水罐中可以充分利用余热,实现铁碳球的自还原;在转炉兑铁前加入可以改善转炉造渣过程、高效回收其中的铁。高炉除尘灰与煤粉混合用于高炉喷吹,可以提高煤粉燃烧率、控制风口燃烧温度,有利高炉低硅冶炼。针对鞍钢高炉锌负荷有所增加的形势,建议选择转底炉工艺处理高杂质含量尘泥。

The kinds and the output of iron-bearing dust and sludge in Ansteel and their physical characteristics are introduced, and several current recycling processes of the iron-bearing dust and sludge are analyzed. The results show that, in view of the process involving with sintering proportioning with the sludge and dust after mixing and pre-treatment, in spite of large amount of utilization, this process is not suitable for handling dust and sludge with high zinc and high alkali metal content. The iron-carbon pellet production process is adopted for the dust and sludge with high zinc and high alkali metal content. The iron-carbon pellets are put in the hot metal ladle, the waste heat can be fully utilized and self-reduction of iron- carbon pellet can be realized; Adding the iron-carbon pellets before charging hot iron in the converter can improve the converter slag-making process and recover the iron in it efficiently. The blast furnace dust mixed with the pulverized coal can be used for the blast furnace injection, this can increase the rate of pulverized coal combustion and control the tuyere combustion temperature, which is favorable for low-silicon smelting of the blast furnace. In view of the situation of the zinc load increasing in Ansteel BF, it is recommended to select the rotary hearth furnace process to treat the the dust and sludge with high impurity content.